[英]PDO Database doesn't return rows, only returns query string (pdo object)
I'm gonna go straight to the point: 我要直截了当地说:
Mysql DB tbl = mycars_gallery Mysql DB tbl = mycars_gallery
|id| car_id|img_thumb |img_link |
-----------------------------------
|5 | 3 |thumb1.jpg|image1.jpg|
|6 | 3 |thumb2.jpg|image2.jpg|
|7 | 3 |thumb3.jpg|image3.jpg|
I have 2 classes: 我有2个班:
Upload.class.php Upload.class.php
class Upload
{
function __construct()
{
// nothing
}
function deleteCarImgs($car_id,$arr_imgids)
{
//weld all img ids and separate by commas
$img_ids = implode(",",$arr_imgids);
$sql = "SELECT img_link, img_thumb ";
.= "FROM mycars_gallery WHERE car_id = :carid AND id IN(:imgids);";
$params = array(
":carid" => $car_id,
":imgids" => $img_ids
);
//DB processing happens in Database class(100% working)
$dbconn = new Database;
$rows = $dbconn->dbProcess($sql, $params); //doesnt run
}
}
Cars.class.php Cars.class.php
class Cars
{
function __construct()
{
// nothing
}
function deleteCompleteCar(3)//car_id is 3
{
$upload = new Upload();
$arr_imgids = array(5,6,7);//these are img_id = 5,6,7 the ones I want to select
$res = $upload->deleteCarImgs($id,$arr_imgids);
var_dump($res);
}
}
var_dump message: var_dump消息:
PDOStatement Object ( [queryString] => SELECT img_link, img_thumb FROM mycars_gallery WHERE car_id = :carid AND id IN(:imgids); )
What I need: All other functions are working correctly, but for this particular classes it seems to be broken. 我需要的是:所有其他功能都正常工作,但对于这个特定的类,它似乎被打破了。 There are absolutely no errors that happen.
绝对没有错误发生。 Instead of getting the image links and thumbs, only query shows up when I use vardump.
我使用vardump时只显示查询,而不是获取图像链接和拇指。 I have a feeling it has to do with 2 classes interacting with each other.
我觉得它与2个相互交互的类有关。
What I've already done: 我已经做了什么:
Thanks a lot in advanced. 非常感谢先进。
Here are a few findings that you might find useful. 以下是您可能会发现有用的一些调查结果。 First is from the PHP manual on PDO::prepare .
首先是来自PDO :: prepare的PHP手册。 But you are passing a single string using
implode()
, but I think this is still something important to keep in mind. 但是你使用
implode()
传递一个字符串,但我认为这仍然是重要的事情要记住。
You cannot bind multiple values to a single named parameter in, for example, the IN() clause of an SQL statement.
您不能将多个值绑定到单个命名参数,例如,SQL语句的IN()子句。
Second and third are probably due to typo: 第二和第三可能是由于拼写错误:
$sql = "SELECT img_link, img_thumb "; // this semi colon will cause syntax error on the next line.
.= "FROM mycars_gallery WHERE car_id = :carid AND id IN(:imgids);";
and, in your table structure you've shown mycar_id
as a column but you have car_id
in your where clause. 并且,在您的表结构中,您已将
mycar_id
显示为列,但在where子句中有car_id
。
Finally, possible solution which I didn't want to copy paste, so here is something you could implement to solve the in
issue: 最后,可能的解决办法,我不想复制粘贴,所以这里是你可以实现解决
in
问题:
PHP PDO: Array in Update SQL WHERE IN () clause PHP PDO:更新SQL WHERE IN()子句中的数组
Can I bind an array to an IN() condition? 我可以将数组绑定到IN()条件吗?
Update: 更新:
Something like this should work, but please keep in mind that $arr_imgids
needs to be an array for this to work: 这样的东西应该可以工作,但请记住
$arr_imgids
需要是一个数组才能工作:
function deleteCarImgs($car_id, $arr_imgids)
{
$in_sql = ':imgid' . implode(',:imgid', $arr_imgids);
$sql = "SELECT img_link, img_thumb
FROM mycars_gallery WHERE car_id = :carid AND id IN({$in_sql});";
$params = array_merge(
array(":carid" => $car_id),
array_combine(explode(',', $in_sql), $arr_imgids)
);
//DB processing happens in Database class(100% working)
$dbconn = new Database;
$rows = $dbconn->dbProcess($sql, $params); //doesnt run
}
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